1 #ifndef _CCID_H 2 #define _CCID_H 3 /* 4 * net/dccp/ccid.h 5 * 6 * An implementation of the DCCP protocol 7 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 8 * 9 * CCID infrastructure 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 */ 15 16 #include <net/sock.h> 17 #include <linux/compiler.h> 18 #include <linux/dccp.h> 19 #include <linux/list.h> 20 #include <linux/module.h> 21 22 #define CCID_MAX 255 23 24 struct tcp_info; 25 26 /** 27 * struct ccid_operations - Interface to Congestion-Control Infrastructure 28 * 29 * @ccid_id: numerical CCID ID (up to %CCID_MAX, cf. table 5 in RFC 4340, 10.) 30 * @ccid_ccmps: the CCMPS including network/transport headers (0 when disabled) 31 * @ccid_name: alphabetical identifier string for @ccid_id 32 * @ccid_hc_{r,t}x_slab: memory pool for the receiver/sender half-connection 33 * @ccid_hc_{r,t}x_obj_size: size of the receiver/sender half-connection socket 34 * 35 * @ccid_hc_{r,t}x_init: CCID-specific initialisation routine (before startup) 36 * @ccid_hc_{r,t}x_exit: CCID-specific cleanup routine (before destruction) 37 * @ccid_hc_rx_packet_recv: implements the HC-receiver side 38 * @ccid_hc_{r,t}x_parse_options: parsing routine for CCID/HC-specific options 39 * @ccid_hc_{r,t}x_insert_options: insert routine for CCID/HC-specific options 40 * @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender 41 * @ccid_hc_tx_send_packet: implements the sending part of the HC-sender 42 * @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender 43 * @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender 44 * @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender 45 */ 46 struct ccid_operations { 47 unsigned char ccid_id; 48 __u32 ccid_ccmps; 49 const char *ccid_name; 50 struct kmem_cache *ccid_hc_rx_slab, 51 *ccid_hc_tx_slab; 52 __u32 ccid_hc_rx_obj_size, 53 ccid_hc_tx_obj_size; 54 /* Interface Routines */ 55 int (*ccid_hc_rx_init)(struct ccid *ccid, struct sock *sk); 56 int (*ccid_hc_tx_init)(struct ccid *ccid, struct sock *sk); 57 void (*ccid_hc_rx_exit)(struct sock *sk); 58 void (*ccid_hc_tx_exit)(struct sock *sk); 59 void (*ccid_hc_rx_packet_recv)(struct sock *sk, 60 struct sk_buff *skb); 61 int (*ccid_hc_rx_parse_options)(struct sock *sk, 62 unsigned char option, 63 unsigned char len, u16 idx, 64 unsigned char* value); 65 int (*ccid_hc_rx_insert_options)(struct sock *sk, 66 struct sk_buff *skb); 67 void (*ccid_hc_tx_packet_recv)(struct sock *sk, 68 struct sk_buff *skb); 69 int (*ccid_hc_tx_parse_options)(struct sock *sk, 70 unsigned char option, 71 unsigned char len, u16 idx, 72 unsigned char* value); 73 int (*ccid_hc_tx_send_packet)(struct sock *sk, 74 struct sk_buff *skb); 75 void (*ccid_hc_tx_packet_sent)(struct sock *sk, 76 int more, unsigned int len); 77 void (*ccid_hc_rx_get_info)(struct sock *sk, 78 struct tcp_info *info); 79 void (*ccid_hc_tx_get_info)(struct sock *sk, 80 struct tcp_info *info); 81 int (*ccid_hc_rx_getsockopt)(struct sock *sk, 82 const int optname, int len, 83 u32 __user *optval, 84 int __user *optlen); 85 int (*ccid_hc_tx_getsockopt)(struct sock *sk, 86 const int optname, int len, 87 u32 __user *optval, 88 int __user *optlen); 89 }; 90 91 extern struct ccid_operations ccid2_ops; 92 #ifdef CONFIG_IP_DCCP_CCID3 93 extern struct ccid_operations ccid3_ops; 94 #endif 95 96 extern int ccid_initialize_builtins(void); 97 extern void ccid_cleanup_builtins(void); 98 99 struct ccid { 100 struct ccid_operations *ccid_ops; 101 char ccid_priv[0]; 102 }; 103 104 static inline void *ccid_priv(const struct ccid *ccid) 105 { 106 return (void *)ccid->ccid_priv; 107 } 108 109 extern bool ccid_support_check(u8 const *ccid_array, u8 array_len); 110 extern int ccid_get_builtin_ccids(u8 **ccid_array, u8 *array_len); 111 extern int ccid_getsockopt_builtin_ccids(struct sock *sk, int len, 112 char __user *, int __user *); 113 114 extern struct ccid *ccid_new(const u8 id, struct sock *sk, bool rx); 115 116 static inline int ccid_get_current_rx_ccid(struct dccp_sock *dp) 117 { 118 struct ccid *ccid = dp->dccps_hc_rx_ccid; 119 120 if (ccid == NULL || ccid->ccid_ops == NULL) 121 return -1; 122 return ccid->ccid_ops->ccid_id; 123 } 124 125 static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp) 126 { 127 struct ccid *ccid = dp->dccps_hc_tx_ccid; 128 129 if (ccid == NULL || ccid->ccid_ops == NULL) 130 return -1; 131 return ccid->ccid_ops->ccid_id; 132 } 133 134 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk); 135 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk); 136 137 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk, 138 struct sk_buff *skb) 139 { 140 int rc = 0; 141 if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL) 142 rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb); 143 return rc; 144 } 145 146 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk, 147 int more, unsigned int len) 148 { 149 if (ccid->ccid_ops->ccid_hc_tx_packet_sent != NULL) 150 ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, more, len); 151 } 152 153 static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk, 154 struct sk_buff *skb) 155 { 156 if (ccid->ccid_ops->ccid_hc_rx_packet_recv != NULL) 157 ccid->ccid_ops->ccid_hc_rx_packet_recv(sk, skb); 158 } 159 160 static inline void ccid_hc_tx_packet_recv(struct ccid *ccid, struct sock *sk, 161 struct sk_buff *skb) 162 { 163 if (ccid->ccid_ops->ccid_hc_tx_packet_recv != NULL) 164 ccid->ccid_ops->ccid_hc_tx_packet_recv(sk, skb); 165 } 166 167 static inline int ccid_hc_tx_parse_options(struct ccid *ccid, struct sock *sk, 168 unsigned char option, 169 unsigned char len, u16 idx, 170 unsigned char* value) 171 { 172 int rc = 0; 173 if (ccid->ccid_ops->ccid_hc_tx_parse_options != NULL) 174 rc = ccid->ccid_ops->ccid_hc_tx_parse_options(sk, option, len, idx, 175 value); 176 return rc; 177 } 178 179 static inline int ccid_hc_rx_parse_options(struct ccid *ccid, struct sock *sk, 180 unsigned char option, 181 unsigned char len, u16 idx, 182 unsigned char* value) 183 { 184 int rc = 0; 185 if (ccid->ccid_ops->ccid_hc_rx_parse_options != NULL) 186 rc = ccid->ccid_ops->ccid_hc_rx_parse_options(sk, option, len, idx, value); 187 return rc; 188 } 189 190 static inline int ccid_hc_rx_insert_options(struct ccid *ccid, struct sock *sk, 191 struct sk_buff *skb) 192 { 193 if (ccid->ccid_ops->ccid_hc_rx_insert_options != NULL) 194 return ccid->ccid_ops->ccid_hc_rx_insert_options(sk, skb); 195 return 0; 196 } 197 198 static inline void ccid_hc_rx_get_info(struct ccid *ccid, struct sock *sk, 199 struct tcp_info *info) 200 { 201 if (ccid->ccid_ops->ccid_hc_rx_get_info != NULL) 202 ccid->ccid_ops->ccid_hc_rx_get_info(sk, info); 203 } 204 205 static inline void ccid_hc_tx_get_info(struct ccid *ccid, struct sock *sk, 206 struct tcp_info *info) 207 { 208 if (ccid->ccid_ops->ccid_hc_tx_get_info != NULL) 209 ccid->ccid_ops->ccid_hc_tx_get_info(sk, info); 210 } 211 212 static inline int ccid_hc_rx_getsockopt(struct ccid *ccid, struct sock *sk, 213 const int optname, int len, 214 u32 __user *optval, int __user *optlen) 215 { 216 int rc = -ENOPROTOOPT; 217 if (ccid->ccid_ops->ccid_hc_rx_getsockopt != NULL) 218 rc = ccid->ccid_ops->ccid_hc_rx_getsockopt(sk, optname, len, 219 optval, optlen); 220 return rc; 221 } 222 223 static inline int ccid_hc_tx_getsockopt(struct ccid *ccid, struct sock *sk, 224 const int optname, int len, 225 u32 __user *optval, int __user *optlen) 226 { 227 int rc = -ENOPROTOOPT; 228 if (ccid->ccid_ops->ccid_hc_tx_getsockopt != NULL) 229 rc = ccid->ccid_ops->ccid_hc_tx_getsockopt(sk, optname, len, 230 optval, optlen); 231 return rc; 232 } 233 #endif /* _CCID_H */ 234